CN103613196B - Integrated biological denitrification device and method for treating wastewater by using same - Google Patents
Integrated biological denitrification device and method for treating wastewater by using same Download PDFInfo
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- CN103613196B CN103613196B CN201310632426.4A CN201310632426A CN103613196B CN 103613196 B CN103613196 B CN 103613196B CN 201310632426 A CN201310632426 A CN 201310632426A CN 103613196 B CN103613196 B CN 103613196B
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an integrated biological denitrification device and a method for treating wastewater by using the same. The biological denitrification device comprises an aerobic reaction pond, a settling pond, a wastewater pond, a water inlet pump, a blast blower, a sludge reflux pump and an aerator, wherein suspended fillers are added into the aerobic reaction pond and are spheres or cylinders; holes which run through the surfaces are distributed on the surfaces and interior of the suspended fillers; the holes on the surfaces of the suspended fillers have the diameter of 1 micron to 20 mm; the holes in the suspended fillers have the diameter of 10 microns to 10 mm. The suspended fillers are filled, so that nitration and denitrification can be finished in the same aerobic reaction pond, an anaerobic pond, a stirrer in the anaerobic pond and an aerobic pond mixed liquid reflux pump system in the traditional A/O biological denitrification process are omitted, and the biological denitrification device has the advantages of simple structure, low energy consumption and the like. By virtue of the method for treating wastewater by using the biological denitrification device, the denitrification efficiency of about 75 percent can be obtained in the aerobic reaction pond.
Description
(1) technical field
The present invention relates to a kind of wastewater treatment equipment and treatment process, in particular to a kind of integrated biological denitrification device and the method processing waste water thereof, can the multiple pollutant such as organics removal, organonitrogen, ammonia nitrogen, nitric nitrogen, be applicable to process trade effluent, municipal effluent.
(2) background technology
Traditional biological denitrogenation method is formed primarily of nitration reaction (nitrogen oxidation end product is nitrate) and anti-nitration reaction (nitrogen reduction end product is nitrogen).Nitration reaction needs oxygen, is an aerobic processes; And anti-nitration reaction does not need oxygen, it is an anoxic process.Therefore, in general, biological denitrification process be one from (as sequencing batch reactor) the time or spatially (as Prepositive denitrification) a kind of bio-denitrification technology that nitration reaction and anti-nitration reaction are separately carried out.
Nitration reaction is the process of nitrate nitrogen by mineralized nitrogen.Nitration reaction comprises two basic reactions steps, and the first stage is nitrite by Nitrosomas (nitrous acid zygosaccharomyces, nitrous acid screw rod Pseudomonas and Nitrosococcus etc.) by mineralized nitrogen, is called nitrosation reaction; Subordinate phase is, by Nitromonas (nitric acid Bacillaceae, spirillum and Coccus etc.), nitrite is further oxidized to nitrate.Nitrosomas and Nitromonas are all chemoautotrophic bacterias, and they utilize CO
2, CO
3 2-and HCO
3 -deng as carbon source, by with NH
3, NH
4 +and NO
2 -redox reaction obtain energy.Anti-nitration reaction is that the nitrate produced in nitrifying process or nitrate reductase are become N
2process.Denitrifying bacteria is the facultative oxygen-starved microorganism of a class chemoheterotrophy, and its reaction need be carried out under anoxic conditions.In reaction process, denitrifying bacteria utilizes various organic substrate as electron donor, carries out Anaerobic respiration using nitrate as electron acceptor(EA).
Traditional biological denitrification process generally adopts A/O technique, is namely made up of anoxic pond-Aerobic Pond-settling tank, comprises 2 return-flow systems: Aerobic Pond mixed-liquor return is back to anoxic pond to anoxic pond, clarifier sludge simultaneously.First return-flow system the oxidation products nitric nitrogen of Aerobic Pond ammonia is back to anoxic pond make denitrifying bacteria be reduced to nitrogen, the clearance of nitrogen depends on and reflux ratio, in order to reach higher nitric efficiency, reflux ratio general control is more than 3, the backflow of such big yield causes process operation energy consumption higher, and nitric efficiency is difficult to ideal.
In order to improve microbe population in biological treatment capabilities and reaction tank, biological catalytic oxidation is developed, mainly in reaction tank, add bio-carrier, such microorganism is not only suspended in water body and most of microorganism can perch and grows at carrier surface.The many filler of current application has fixed filler and floating stuffing, type and material kind a lot.Large quantifier elimination and engineer applied show, bio-carrier can significantly improve microbe population, and removal efficiency also can obviously be promoted.But the bio-carrier of exploitation is very limited for the biological denitrificaion efficiency in Aerobic Pond at present.
In order to simplify traditional biological denitrification process, improving biological denitrificaion efficiency, reduce energy consumption, this has researched and developed a kind of bio-carrier that can form anaerobic environment in Aerobic Pond, this bio-carrier is put in Aerobic Pond, can realize nitrification and denitrification reaction, nitric efficiency can meet or exceed traditional biological denitrification process simultaneously.
The bio-carrier inside developed has anaerobic environment region and aerobic environmental area, be conducive to aerobic nitrifier and do not need the denitrifying bacteria of oxygen to survive on same carrier simultaneously, synchronously can realize nitration denitrification reaction, be gaseous nitrogen by the nitrogen transformation in water body simultaneously.The good oxygen condition of carrier outside does not have an impact for the anaerobic environment of carrier inside.Therefore, use the biotechnology of this novel carriers, a kind of new integrated biological denitrification method and technique can be formed.
(3) summary of the invention
The object of the invention is to provide a kind of method of integrated biological denitrification device and process waste water thereof, solve the problems such as traditional biological denitrification process structures are many, complicated operation, the anoxic pond in traditional biological denitrification process, stirring system wherein and mixed-liquor return system be can realize banning, the nitrogen synchronous nitration in waste water, denitrifying true tumor treatment technology realized.
The technical solution used in the present invention is:
The invention provides a kind of integrated biological denitrification device, described biological denitrification apparatus comprises aerobic reaction pond, settling tank, wastewater disposal basin, intake pump, gas blower, sludge reflux pump and aerator, side, described aerobic reaction pond is respectively equipped with water-in and water outlet, be provided with sludge reflux entrance bottom described aerobic reaction pond, described aerobic reaction pond inner bottom is provided with aerator, described settling tank top is provided with water port, settling tank bottom is provided with sludge reflux outlet, described aerobic reaction pond water-in is communicated with wastewater disposal basin by intake pump, described aerobic reaction pond water outlet is communicated with settling tank by pipeline, described aerator is communicated with gas blower by pipeline, described sludge reflux entrance is by sludge reflux pump and sludge reflux outlet, floating stuffing is added with in described aerobic reaction pond, described floating stuffing be surface and inner be distributed with the hole through with surface spheroid or cylinder (shape of described filler is not fixed, the size in hole can be uneven), the diameter footpath of described floating stuffing surface hole defect is 1 μm ~ 20mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm.
Further, described floating stuffing is made up of polypropylene, polystyrene, polyethylene, nylon, polyamide fibre or polyurethane.
Further, described floating stuffing density is 0.88 ~ 1.28g/cm
3.
Further, described floating stuffing shape is not limit, and diameter projected is 50mm ~ 150mm.
Further, the diameter of described floating stuffing surface hole defect is 10 μm ~ 15mm, and the diameter of described floating stuffing inner void is 10 μm ~ 8mm, and density is 0.88 ~ 0.98g/cm
3.
Further, the dosage of described floating stuffing is 1.5 ~ 6kg/m
3.
Further, described water outlet is provided with net-like spacer, and described mesh diameter is 25mm ~ 100mm.
The present invention also provides a kind of method utilizing described integrated biological denitrification device process waste water, described method is: in aerobic reaction pond, first feed the clear water of 1/4 ~ 1/3, and open gas blower aeration, again active sludge is inoculated in aerobic reaction pond, aeration is after 1 ~ 2 day, floating stuffing is added aerobic reaction pond, then intake pump is opened, waste water is pumped into aerobic reaction pond and form waste water mixed solution, now regulate gas blower aeration rate size, the DO value controlling waste water mixed solution in aerobic reaction tank is not less than 2mg/L, waste water after process enters settling tank by water outlet, waste water after settling tank precipitation is discharged by water port, the mud that precipitation produces is exported by sludge reflux and enters aerobic reaction pond through reflux pump, controlling sludge concentration in reaction tank is 2 ~ 3g/L, sludge reflux flow and flooding velocity ratio are 0.5 ~ 1:1, described floating stuffing is surface and inner spheroid or the cylinder being distributed with the hole through with surface, the diameter of described floating stuffing surface hole defect is 1 μm ~ 20mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm, described floating stuffing diameter projected is 50mm ~ 150mm, the dosage of described floating stuffing is 1.5 ~ 6kg/m
3.
Further, in described reaction tank, sludge concentration is 2 ~ 3g/L, and sludge reflux flow and flooding velocity ratio are 1:1.
In integrated biological denitrification device of the present invention, being equiped with aerator bottom described aerobic reaction pond is water body oxygenation, and described aerator is tubular type, plate-type aerator, and material is not limit.Described settling tank is any one in radical sedimentation basin, rectangular sedimentation tank, vertical-flow precipitation or inclined-plate clarifying basin, and described net-like spacer is arranged between reaction tank and settling tank, interception floating stuffing, prevents filler from flowing into settling tank.
In the procedure of integrated biological denitrification device process waste water of the present invention, the oxidation operation of waste water, ammonium oxidation and nitrate-nitrogen reduction all complete in same aerobic reaction pond, the aerodynamic force entered by aerator is not only water body oxygenation and floating stuffing can be made to move in water body, the microorganism panning be distributed in floating stuffing and water body gives up Organic substance in water, nitrogen and dissolved oxygen carry out metabolic activity, automatically settling tank is flowed into after waste water is thoroughly processed, after sufficient dwell time, microorganism in waste water is deposited at the bottom of pond, and supernatant liquor is discharged through settling tank water port, the microorganism be deposited at the bottom of pond is sent to aerobic reaction pond by sludge circulation pump, to maintain microbial biomass stable in Aerobic Pond.
Gas blower aeration makes dissolved oxygen concentration rising in muddy water in aerobic reaction pond, when the water body after oxygenation can diffuse into floating stuffing inside, due to the twine (i.e. hole wall) of floating stuffing surfaces externally and internally being all attached with microorganism, along with going deep into of filler inside, dissolved oxygen in the microbes preferential absorption water body of outside surface, now, the microorganism of outside surface is mainly to take the photograph the aerobic microbiological of oxygen.Enter the very low even anaerobic of dissolved oxygen in the water body of floating stuffing inside, inner microorganism develops into anoxic microorganism and anaerobion gradually.If floating stuffing outside surface and the outside microbial host aerobic microbiological be not attached on filler, a part of aerobic microbiological can decomposing organic matter, and a part of microorganism is nitrifier can be nitric nitrogen by ammonium oxidation; The microorganism of floating stuffing inside is anoxic microorganism and anaerobion, nitrate-nitrogen reduction is organicly nitrogen in picked-up simultaneously thus reaches the object of denitrogenation by anoxic microorganism, and it is small organic molecule, the carbonic acid gas etc. such as lipid acid that anaerobion can carry out anaerobic respiration by organic substance decomposing.
Compared with prior art, beneficial effect of the present invention is mainly reflected in: make nitrated by filling floating stuffing, denitrification can complete in same aerobic reaction pond, which save the anoxic pond of traditional A/O biological denitrification process, agitator in anoxic pond and Aerobic Pond mixed-liquor return pump system, therefore to have structure simple in the present invention, low power consumption and other advantages, utilize the method for process waste water of the present invention can obtain in aerobic reaction pond about 75% nitric efficiency (existing A/O technique denitride technology is also about 75%, and in Aerobic Pond biological denitrificaion efficiency not higher than 10%, see reference document: (Wu Chengqiang, Wang Guodong, Li Hongyan, Yang Min. denitrification Sludge Bed and aerobic biofilm integrated bio-reactor. China Environmental Science, 2003, 23 (6): 640 ~ 643.) and (Zhu Guibing, Peng Yongzhen, Zhou Li, Ma Yong, Zhang Xinlan. optimizing fractional influent and biological denitrification process design parameter, 2004, 20 (9): 64-64.).
(4) accompanying drawing explanation
Fig. 1 integrated biological denitrification system architecture schematic diagram: 1-aerobic reaction pond, 2-settling tank, 3-water-in, 4-water outlet, 5-aerator, 6-gas blower, 7-intake pump, 8-wastewater disposal basin, 9-dividing plate, 10-water port, 11-sludge reflux exports, 12-sludge reflux entrance, 13-sludge reflux pump, 14-floating stuffing.
(5) embodiment
Below in conjunction with specific embodiment, the present invention is described further, but protection scope of the present invention is not limited in this:
Embodiment 1 one kinds of integrated biological denitrification devices
With reference to Fig. 1, a kind of integrated biological denitrification device, described biological denitrification apparatus comprises aerobic reaction 1, settling tank 2, wastewater disposal basin 8, intake pump 7, gas blower 6, sludge reflux pump 13 and aerator 5, side, described aerobic reaction pond is respectively equipped with water-in 3 and water outlet 4, be provided with sludge reflux entrance 12 bottom described aerobic reaction pond, described aerobic reaction pond inner bottom is provided with aerator 5, described settling tank top is provided with water port 10, settling tank bottom is provided with sludge reflux outlet 11, described aerobic reaction pond water-in 3 is communicated with wastewater disposal basin 8 by intake pump 7, described aerobic reaction pond water outlet 4 is communicated with settling tank 2 by pipeline, described aerator 5 is communicated with gas blower 6 by pipeline, described sludge reflux entrance 12 exports 11 by sludge reflux pump 13 with sludge reflux and is communicated with, floating stuffing 14 is added with in described aerobic reaction pond, described floating stuffing 14 is surface and inner spheroid or the cylinder being distributed with the hole through with surface, the diameter of described floating stuffing surface hole defect is 1 μm ~ 20mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm, described floating stuffing density is 0.88 ~ 1.28g/cm
3, described floating stuffing shape is not limit, and diameter projected is 50mm ~ 150mm, and the dosage of described floating stuffing is 1.5 ~ 6kg/m
3.
Embodiment 2
Integrated biological denitrification device described in embodiment 1 is adopted to carry out wastewater treatment, described floating stuffing is spheroid prepared by polyethylene, diameter is 50mm, the diameter of described floating stuffing surface hole defect is 10 μm ~ 10mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm, and described floating stuffing density is 0.98g/cm
3, the dosage of described floating stuffing is 4kg/m
3; Described aerator 5 is ceramic micropore aerator, and upper part of described settling tank 2 is square pond, and lower part is back taper pond, and Aerobic Pond water outlet aperture is DN15mm, without the need to arranging dividing plate.Aerobic reaction pond useful volume is 8L, settling tank useful volume is 2L.
Method of wastewater treatment: the clear water first feeding 2 ~ 3L in aerobic reaction pond, and open gas blower aeration, again the residue biological sludge of municipal sewage plant is inoculated in aerobic reaction pond, after 1 ~ 2 day, floating stuffing is added aerobic reaction pond, then intake pump is opened, waste water is pumped into aerobic reaction pond and form waste water mixed solution, now regulate gas blower aeration rate size, the DO value controlling waste water mixed solution in aerobic reaction tank is 3 ~ 4mg/L, waste water after process enters settling tank by water outlet, waste water after settling tank precipitation is discharged by water port, the mud that precipitation produces is exported by sludge reflux and enters aerobic reaction pond through reflux pump, controlling sludge concentration in reaction tank is 2 ~ 3g/L, sludge reflux flow and flooding velocity ratio are 1:1.
The waste water of test is for manually to prepare waste water, adopt the configuration of starch, ammonium chloride, potassium hydrogen phosphate to form, COD is 698 ~ 823mg/L, total phosphorus is 6 ~ 6.8mg/L, ammonia nitrogen concentration is 56.2 ~ 87.3mg/L, total nitrogen concentration is 62.9 ~ 92.3mg/L, pH7.5 ~ 8.5.
Aerobic reaction pond is run and is started, and flooding velocity is 4L/d, and hydraulic detention time is 2d, dissolved oxygen controls at 3 ~ 4mg/L, runs 15 days, when ammonia nitrogen and nitrogen removal rate reach more than 91% and 69%, regulate the valve of intake pump, flooding velocity is improved 30%(and 5.2L/d); Now, COD processing load reaches 0.45 ~ 0.54kg/ (m
3.d), regulate blower conduits valve, control dissolved oxygen 3 ~ 4mg/L, run 35 days, when ammonia nitrogen and nitrogen removal rate reach more than 95% and 77%, regulate the valve of intake pump, flooding velocity is improved 25%(and 6.5L/d); Now, COD processing load reaches 0.61kg/ (m
3.d) left and right, regulates blower conduits valve, controls dissolved oxygen 3 ~ 4mg/L, runs 35 days.Through the Start-up and operating performance of 3 months, aerobic reaction pond inner suspension sludge concentration reaches 2.2 ~ 3.5g/L, on its floating stuffing, sludge concentration is that 2.1 ~ 2.5g/L, COD and ammonia nitrogen removal frank reach more than 94% and 91% respectively, and now nitrogen removal rate can reach 77.3%.But nitrogen removal rate associates larger with flow, inlet COD concentration.Test run the results are shown in Table 1.
The test run result of table 18L testing apparatus
Embodiment 3:
Integrated biological denitrification device described in embodiment 1 is adopted to carry out wastewater treatment, aerobic reaction pond useful volume is 110L, described water outlet 4 place is provided with net-like spacer 9, described net-like spacer 9 is fixed on water outlet and is positioned on the inwall of aerobic reaction pond, described clapboard aperture is 20mm, floating stuffing adopts polyethylene material, diameter is 150mm, the diameter of described floating stuffing surface hole defect is 1 μm ~ 20mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm, and described floating stuffing density is 0.98g/cm
3, the dosage of described floating stuffing is 5.2kg/m
3; Described aerator 5 is ceramic micropore aerator, and upper part of described settling tank 2 is square pond, and lower part is back taper pond.
Method of wastewater treatment is with embodiment 2, first in aerobic reaction pond, feed the clear water of 28 ~ 36L, and open gas blower aeration, again the residue biological sludge of municipal sewage plant is inoculated in aerobic reaction pond, after 2 days, floating stuffing is added aerobic reaction pond, then intake pump is opened, waste water is pumped into aerobic reaction pond and form waste water mixed solution, now regulate gas blower aeration rate size, keep the dissolved oxygen in water body to be 3 ~ 5mg/L; Reflux pump is by sludge reflux in settling tank to aerobic reaction pond, and to maintain in Aerobic Pond suspended sludge concentration 3 ~ 3.5g/L in water body, sludge reflux flow and flooding velocity are than being 1:1; The waste water of test is city domestic sewage, and COD is 201 ~ 274mg/L, total phosphorus is 1.73 ~ 9.78mg/L, ammonia nitrogen concentration is 26.2 ~ 44.4mg/L, pH7 ~ 7.5.
Aerobic reaction pond is run and is started, and flooding velocity is 144L/d, and hydraulic detention time is 0.76d, dissolved oxygen controls at 3 ~ 4mg/L, runs 18 days, when ammonia nitrogen and nitrogen removal rate reach more than 90% and 61%, regulate the valve of intake pump, flooding velocity is improved 30.5%(and 188L/d); Now, COD processing load reaches 0.34 ~ 0.44kg/ (m
3.d), regulate blower conduits valve, control dissolved oxygen 3 ~ 4mg/L, run 27 days, when ammonia nitrogen and nitrogen removal rate reach more than 92% and 68%, regulate the valve of intake pump, flooding velocity is improved 30.3%(and 245L/d); Now, COD processing load reaches 0.49 ~ 0.61kg/ (m
3.d) left and right, regulates blower conduits valve, controls dissolved oxygen 3 ~ 4mg/L, runs 40 days.Through the Start-up and operating performance of nearly 3 months, aerobic reaction pond inner suspension sludge concentration reaches 1.2 ~ 2.5g/L, on its dedicated carrier, sludge concentration is 1.8 ~ 2.2g/L, COD and ammonia nitrogen removal frank reach more than 85% and 93% respectively, now, nitrogen removal rate is up to 80.4%, and meanwhile, nitrogen removal rate associates larger with flow, inlet COD concentration.Test run the results are shown in Table 2.
The test run result of table 2110L testing apparatus
Claims (9)
1. an integrated biological denitrification device, described biological denitrification apparatus comprises aerobic reaction pond, settling tank, wastewater disposal basin, intake pump, gas blower, sludge reflux pump and aerator, side, described aerobic reaction pond is respectively equipped with water-in and water outlet, be provided with sludge reflux entrance bottom described aerobic reaction pond, described aerobic reaction pond inner bottom is provided with aerator, described settling tank top is provided with water port, settling tank bottom is provided with sludge reflux outlet, described aerobic reaction pond water-in is communicated with wastewater disposal basin by intake pump, described aerobic reaction pond water outlet is communicated with settling tank by pipeline, described aerator is communicated with gas blower by pipeline, described sludge reflux entrance is by sludge reflux pump and sludge reflux outlet, it is characterized in that: in described aerobic reaction pond, be added with floating stuffing, described floating stuffing is surface and inner spheroid or the cylinder being distributed with the hole through with surface, the diameter of described floating stuffing surface hole defect is 1 μm ~ 20mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm.
2. a kind of integrated biological denitrification device as claimed in claim 1, is characterized in that described floating stuffing is made up of polypropylene, polystyrene, polyethylene, nylon, polyamide fibre or polyurethane.
3. a kind of integrated biological denitrification device as claimed in claim 1, is characterized in that described floating stuffing density is 0.88 ~ 1.28g/cm
3.
4. a kind of integrated biological denitrification device as claimed in claim 1, is characterized in that described floating stuffing diameter projected is 50mm ~ 150mm.
5. a kind of integrated biological denitrification device as claimed in claim 1, it is characterized in that the diameter of described floating stuffing surface hole defect is 10 μm ~ 15mm, the diameter of described floating stuffing inner void is 10 μm ~ 8mm, and density is 0.88 ~ 0.98g/cm
3.
6. a kind of integrated biological denitrification device as claimed in claim 1, is characterized in that the dosage of described floating stuffing is 1.5 ~ 6kg/m
3.
7. a kind of integrated biological denitrification device as claimed in claim 1, it is characterized in that described water outlet is provided with net-like spacer, described mesh diameter is 25mm ~ 100mm.
8. utilize a method for integrated biological denitrification device process waste water described in claim 1, it is characterized in that described method is:
First in aerobic reaction pond, inject the clear water of 1/4 ~ 1/3, and open gas blower aeration, again active sludge is inoculated in aerobic reaction pond, aeration is after 1 ~ 2 day, floating stuffing is added aerobic reaction pond, then intake pump is opened, waste water is pumped into aerobic reaction pond and form waste water mixed solution, now regulate gas blower aeration rate size, the DO value controlling waste water mixed solution in aerobic reaction tank is not less than 2mg/L, waste water after process enters settling tank by water outlet, waste water after settling tank precipitation is discharged by water port, the mud that precipitation produces is exported by sludge reflux and enters aerobic reaction pond through reflux pump, controlling sludge concentration in reaction tank is 2 ~ 3g/L, sludge reflux flow and flooding velocity ratio are 0.5 ~ 1:1, described floating stuffing is surface and inner spheroid or the cylinder being distributed with the hole through with surface, the diameter of described floating stuffing surface hole defect is 1 μm ~ 20mm, the diameter of described floating stuffing inner void is 10 μm ~ 10mm, described floating stuffing diameter projected is 50mm ~ 150mm, the dosage of described floating stuffing is 1.5 ~ 6kg/m
3.
9. utilize the method for integrated biological denitrification device process waste water as claimed in claim 8, it is characterized in that in described reaction tank, sludge concentration is 2 ~ 3g/L, sludge reflux flow and flooding velocity ratio are 1:1.
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| CN105254013A (en) * | 2015-11-20 | 2016-01-20 | 江苏合一水业有限公司 | Sewage treatment tank |
| CN108503123A (en) * | 2017-02-25 | 2018-09-07 | 新乡市新能环保工程有限公司 | Industrial water drainage treatment process containing high concentration organic contaminant |
| CN108046540A (en) * | 2018-01-22 | 2018-05-18 | 云南合续环境科技有限公司 | A kind of synchronous nitration and denitrification sewage water treatment method and its device |
| CN113860494B (en) * | 2021-08-24 | 2023-07-18 | 江苏海洋大学 | Integrated wastewater denitrification process based on synchronous nitrification and denitrification |
| CN114314826B (en) * | 2021-12-28 | 2023-05-02 | 四川发展国润水务投资有限公司 | Autotrophic denitrification fiber chain type suspension ball and manufacturing method thereof |
| CN118026397A (en) * | 2024-03-11 | 2024-05-14 | 广州市山水生态环保建设有限公司 | Landscape ecological sewage treatment system and operation method thereof |
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